<script setup>
import ossService from '@/api/oss/index.js'
import { getToken } from '@/utils/auth'
import 'element-plus/theme-chalk/el-loading.css'
import Message from 'vue-m-message'

defineOptions({
  name: 'FileUpload',
})

const props = defineProps({
  modelValue: [String, Object, Array],
  // 数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ['doc', 'xls', 'ppt', 'txt', 'pdf'],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
  showFileDelete: {
    type: Boolean,
    default: true,
  },
  // 上传提示
  tips: {
    type: String,
    default: '',
  },
})

const emit = defineEmits(['update:modelValue', 'change'])
const { proxy } = getCurrentInstance()
const number = ref(0)
const uploadList = ref([])
const baseUrl = import.meta.env.VITE_APP_BASE_API + (import.meta.env.MODE === 'development' ? '' : '/')
const uploadFileUrl = ref(`${baseUrl}system/oss/upload`) // 上传文件服务器地址
const headers = ref({ Authorization: `Bearer ${getToken()}` })
const fileList = ref([])
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize),
)

watch(() => props.modelValue, async (val) => {
  if (val) {
    let temp = 1
    // 首先将值转为数组
    let list
    if (Array.isArray(val)) {
      list = val
    }
    else {
      await ossService.listByIds(val).then((res) => {
        list = res.data.map((oss) => {
          oss = { name: oss.originalName, url: oss.url, ossId: oss.ossId }
          return oss
        })
      })
    }
    // 然后将数组转为对象数组
    fileList.value = list.map((item) => {
      item = { name: item.name, url: item.url, ossId: item.ossId }
      item.uid = item.uid || new Date().getTime() + temp++
      return item
    })
  }
  else {
    fileList.value = []
    return []
  }
}, { deep: true, immediate: true })

// 上传前校检格式和大小
function handleBeforeUpload(file) {
  // 校检文件类型
  if (props.fileType.length) {
    const fileName = file.name.split('.')
    const fileExt = fileName[fileName.length - 1]
    const isTypeOk = props.fileType.includes(fileExt)
    if (!isTypeOk) {
      proxy.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}格式文件!`)
      return false
    }
  }
  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize
    if (!isLt) {
      Message.error(`上传文件大小不能超过 ${props.fileSize} MB!`, {
        zIndex: 999999,
      })
      return false
    }
  }
  proxy.$modal.loading('正在上传文件，请稍候...')
  number.value++
  return true
}

// 文件个数超出
function handleExceed() {
  Message.error(`上传文件数量不能超过 ${props.limit} 个!`, {
    zIndex: 999999,
  })
}

// 上传失败
function handleUploadError(err) {
  // proxy.$modal.msgError('上传文件失败')
  Message.error(`上传文件失败: ${err.message}`, {
    zIndex: 999999,
  })
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  console.log(res)
  if (res.code === 200) {
    uploadList.value.push({ name: res.data.fileName, url: res.data.url, ossId: res.data.ossId })
    uploadedSuccessfully()
  }
  else {
    number.value--
    proxy.$modal.closeLoading()
    proxy.$modal.msgError(res.msg)
    proxy.$refs.fileUpload.handleRemove(file)
    uploadedSuccessfully()
  }
}

// 删除文件
function handleDelete(index) {
  fileList.value.splice(index, 1)
  emit('update:modelValue', listToString(fileList.value))
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value)
    uploadList.value = []
    number.value = 0
    console.log(fileList.value)
    emit('update:modelValue', listToString(fileList.value))
    emit('change', fileList.value)
    proxy.$modal.closeLoading()
  }
}

// 获取文件名称
function getFileName(name) {
  // 如果是url那么取最后的名字 如果不是直接返回
  if (name.includes('/')) {
    return name.slice(name.lastIndexOf('/') + 1)
  }
  else {
    return name
  }
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = ''
  separator = separator || ','
  for (const i in list) {
    if (list[i].url) {
      strs += list[i].ossId + separator
    }
  }
  return strs !== '' ? strs.substr(0, strs.length - 1) : ''
}
</script>

<template>
  <div class="upload-file">
    <el-upload
      ref="fileUpload"
      multiple
      drag
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      :accept="fileType.map(ext => `.${ext}`).join(',')"
    >
      <div class="mb-3">
        <img src="@/assets/images/upload.png" alt="upload">
      </div>
      <!-- 上传按钮 -->
      <el-button type="primary" text>
        选取{{ tips }}文件
      </el-button>
    </el-upload>
    <!-- 上传提示 -->
    <div v-if="showTip" class="el-upload__tip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType.length > 0">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>
    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
      <li v-for="(file, index) in fileList" :key="file.uid" class="el-upload-list__item ele-upload-list__item-content">
        <el-link :href="`${file.url}`" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div v-if="showFileDelete" class="ele-upload-list__item-content-action">
          <el-link :underline="false" type="danger" @click="handleDelete(index)">
            删除
          </el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
  border-bottom: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}

.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
